Tarnowo Nowe was formerly part of the German Empire. In the German Empire, the place was called Tarnau.
The place is now called Tarnowo Nowe and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Neu-Tarnowo | German Empire | Kosten | before the Versailles Treaty |
| Tarnowo Nowe | Poland | Kościan | after the Versailles Treaty |
| Tarnau | German Empire | Kosten (Wartheland) | 1939 |
| Tarnowo Nowe | Poland | Kościan | 1945 |
| Tarnowo Nowe | Poland | Poznań | 1992 |